Linear and nonlinear analyses of water waves in an elastic vessel are carried out to study the dramatic phenomena of Dragon Wash as well as related controllable experiments. It is proposed that the capillary edge wave...Linear and nonlinear analyses of water waves in an elastic vessel are carried out to study the dramatic phenomena of Dragon Wash as well as related controllable experiments. It is proposed that the capillary edge waves are generated by parametric resonance, which is shown to be a possible mechanism for both rectangular an circular vessels. For circular vessel, the normal geometric resonance is also operating, thus greatly. enhance the dramatic effect. The mechanism of nonlinear mode-mode interaction is proposed far the generation of axisymmetric low-frequency gravity waves by the high-frequency external excitation. A simple model system is studied numerically to demonstrate explicitly this interaction mechanism.展开更多
Recent experiments related to the Dragon Wash phenomena showed that axisymmetric capillary waves appear first from excitation, and circumferential capillary waves appear after increase of the excitation strength. Base...Recent experiments related to the Dragon Wash phenomena showed that axisymmetric capillary waves appear first from excitation, and circumferential capillary waves appear after increase of the excitation strength. Based on this new finding, a theory of parametric resonance is developed in detail to explain the on- set of the prominent circumferential capillary waves. Numerical computation is also carried out and the results agree generally with the experiments. Analysis and nu- merical computation are also presented to explain the generation of axisymmetric low-frequency gravity waves by tile high-frequency external excitation.展开更多
针对波浪能发电量取决于当地波浪特征和波浪能发电装置,而传统单一的波能流密度评估法则只考虑了地区波浪特性,未结合装置加以分析,评估结果偏向理论的问题,本文利用欧洲中期天气预报中心(European Centre for Medium-Range Weather For...针对波浪能发电量取决于当地波浪特征和波浪能发电装置,而传统单一的波能流密度评估法则只考虑了地区波浪特性,未结合装置加以分析,评估结果偏向理论的问题,本文利用欧洲中期天气预报中心(European Centre for Medium-Range Weather Forecasts, ECMWF)提供的第五代大气再分析数据集(ECMWF Reanalysis v5, ERA5)中的再分析波浪数据,通过装置得分的波浪能评估方法对北太平洋区域1979—2020年波浪能的空间分布进行了分析。结果表明:在本研究所涉及的地区中,纬度较高的地区波能流密度大且装置得分高,本研究所用评估方法的结论同传统评估方法一致,但在中国南海和部分太平洋纬度较低的地区,发电装置有着较好的连续发电条件,发电效率较高。不同装置间的适配区域也有很大不同,AquaBuoy和Pelamis装置的最佳适用区位于北太平洋纬度较高的地区,而Wave Dragon装置的最佳适用区范围更广,在150°E—160°W之间的纬度较低的地区也表现突出。对于中国南海海域,AquaBuoy装置的适配性最好,而北太平洋纬度较高的地区则最适合布置Pelamis装置,北太平洋纬度中游和较低区域最适合布置Wave Dragon装置。展开更多
文摘Linear and nonlinear analyses of water waves in an elastic vessel are carried out to study the dramatic phenomena of Dragon Wash as well as related controllable experiments. It is proposed that the capillary edge waves are generated by parametric resonance, which is shown to be a possible mechanism for both rectangular an circular vessels. For circular vessel, the normal geometric resonance is also operating, thus greatly. enhance the dramatic effect. The mechanism of nonlinear mode-mode interaction is proposed far the generation of axisymmetric low-frequency gravity waves by the high-frequency external excitation. A simple model system is studied numerically to demonstrate explicitly this interaction mechanism.
文摘Recent experiments related to the Dragon Wash phenomena showed that axisymmetric capillary waves appear first from excitation, and circumferential capillary waves appear after increase of the excitation strength. Based on this new finding, a theory of parametric resonance is developed in detail to explain the on- set of the prominent circumferential capillary waves. Numerical computation is also carried out and the results agree generally with the experiments. Analysis and nu- merical computation are also presented to explain the generation of axisymmetric low-frequency gravity waves by tile high-frequency external excitation.
